Description
Envoy is a high-performance edge/middle/service proxy. Prior to 1.37.1, 1.36.5, 1.35.8, and 1.34.13, the Envoy RBAC (Role-Based Access Control) filter contains a logic vulnerability in how it validates HTTP headers when multiple values are present for the same header name. Instead of validating each header value individually, Envoy concatenates all values into a single comma-separated string. This behavior allows attackers to bypass RBAC policies—specifically "Deny" rules—by sending duplicate headers, effectively obscuring the malicious value from exact-match mechanisms. This vulnerability is fixed in 1.37.1, 1.36.5, 1.35.8, and 1.34.13.
INFO
Published Date :
2026-03-10T19:01:28.062Z
Last Modified :
2026-03-10T20:12:40.604Z
Source :
GitHub_M
AFFECTED PRODUCTS
The following products are affected by CVE-2026-26308 vulnerability.
| Vendors | Products |
|---|---|
| Envoyproxy |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2026-26308.
